<template>
  <div>
    <!-- 工作日历, 年和月 -->
    <div class="select-box">
      <!-- 年份下拉数据 -->
      <el-select v-model="currentYear" size="small" style="width: 120px; margin-right: 10px">
        <!-- 年份取给定年份的, 前五年 + 后五年 -->
        <el-option v-for="item in yearList" :key="item" :label="item" :value="item" />
      </el-select>
      <!-- 月份下拉数据 -->
      <el-select v-model="currentMonth" size="small" style="width: 120px;">
        <el-option v-for="item in 12" :key="item" :label="item" :value="item" />
      </el-select>
    </div>
    <el-calendar v-model="currentDate">
      <!-- 通过作用域插槽自定义日历单元格内容 -->
      <template #dateCell="{ date }">
        <div class="date-content">
          <!-- 几号 -->
          <span class="text">{{ date.getDate() }}</span>
          <!-- 如果是周六日显示 休 字 -->
          <span v-if="isWeek(date)" class="rest">休</span>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
export default {
  props: {
    startDate: {
      type: Date,
      default: () => {
        return new Date()
      }
    }
  },
  data() {
    return {
      currentYear: null, // 当前年份
      currentMonth: null, // 当前月份
      currentDate: new Date()
    }
  },
  computed: {
    yearList() {
      /** const arr = []
      const year = this.startDate.getFullYear()
      for (let i = 0; i <= 10; i++) {
        // 当前年份前后 + 5年
        arr.push(year - 5 + i)
      }
      return arr */

      // 装逼写法
      return Array(11).fill(null).map((item, i) => this.startDate.getFullYear() - 5 + i)
    }
  },
  // data，computed，props的数据都可以侦听
  watch: {
    // 侦听 currentDate 的变化，变了之后把最新的日期对象的年和月赋值给 currentYear 和 currentMonth
    currentDate(newVal) {
      this.currentYear = newVal.getFullYear()
      this.currentMonth = newVal.getMonth() + 1
    }
  },
  created() {
    this.currentYear = this.startDate.getFullYear() // 得到当前年份
    this.currentMonth = this.startDate.getMonth() + 1 // 当前月份
  },
  methods: {
    isWeek(date) {
      // if (date.getDay() === 6 || date.getDay() === 0) {
      //   return true
      // }
      // 判断当前的日期是周几，如果在则显示休
      return [0, 6].includes(date.getDay())
    }
  }
}
</script>

<style lang="scss" scoped>
.select-box {
  display: flex;
  justify-content: flex-end;
}
::v-deep .el-calendar-day {
  height:  auto;
 }
::v-deep .el-calendar-table__row td::v-deep .el-calendar-table tr td:first-child, ::v-deep .el-calendar-table__row td.prev{
  border: none;
 }
.date-content {
  height: 40px;
  text-align: center;
  line-height: 40px;
  font-size: 14px;
}
.date-content .rest {
  color: #fff;
  border-radius: 50%;
  background: rgb(250, 124, 77);
  width: 20px;
  height: 20px;
  line-height: 20px;
  display: inline-block;
  font-size: 12px;
  margin-left: 10px;
}
.date-content .text{
  width: 20px;
  height: 20px;
  line-height: 20px;
 display: inline-block;

}
::v-deep .el-calendar-table td.is-selected .text{
   background: #409eff;
   color: #fff;
   border-radius: 50%;
 }
::v-deep .el-calendar__header {
   display: none
}
</style>
